content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.operators;
  
  import java.util.Objects;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.*;
  
  /**
   * Additional operators in the form of {@link CompletableTransformer},
   * use {@link Completable#compose(CompletableTransformer)}
   * to apply the operators to an existing sequence.
   *
   * @see Completables
   * @since 0.20.2
   */
  public final class CompletableTransformers {
  
      /** Utility class. */
      private CompletableTransformers() {
          throw new IllegalStateException("No instances!");
      }
  
      /**
       * Maps the terminal signals of the upstream into {@link CompletableSource}s and
       * subscribes to it, relaying its terminal events to the downstream.
       * @param onCompleteHandler called when the upstream completes normally and should return
       * the CompletableSource to continue with.
       * @param onErrorHandler called when the upstream fails and should return the
       * CompletableSource for the given Throwable instance to continue with.
       * @return the new CompletableTransformer instance
       * @since 0.20.2
       */
      public static CompletableTransformer flatMap(
              Supplier<? extends CompletableSource> onCompleteHandler,
              Function<? super Throwable, ? extends CompletableSource> onErrorHandler) {
          Objects.requireNonNull(onCompleteHandler, "onCompleteHandler is null");
          Objects.requireNonNull(onErrorHandler, "onErrorHandler is null");
          return new CompletableFlatMapSignalCompletable(null, onCompleteHandler, onErrorHandler);
      }
  }
  